3 years ago

The sum of three times a number and 10 is 31.Find the number.

Mathematics

1 answer:

olga55 [171]3 years ago

4 0

Answer:

Step-by-step explanation:

Let the number be n.

$3n+10=31$

Subtract 10 from both sides:

$3n+10-10=31-10$

$3n=21$

Divide both sides by 3:

$\frac{3n}{3}=\frac{21}{3}$

$n=7$

You might be interested in

Does the blue on the graph represent a function ?

choli [55]

Answer:

Nope

Step-by-step explanation:

It doesnt. Functions look like that

6 0

3 years ago

Read 2 more answers

Can you help me with this question

love history [14]

Answer:

x=−7/2,−1+i√2−1−i√2

Step-by-step explanation:

5 0

3 years ago

I need help. Find the value of each variable.

azamat

Answer:

x=8, y=4 $\sqrt{3}$

Look up the 30-60-90 triangle rule

8 0

2 years ago

Read 2 more answers

If n(A) =15 n (B) = 9 n(A∩B) =4 <br> find n(A U B)

Xelga [282]

Answer:

Step-by-step explanation:

n(A) only =15-4=11

n(B) only=9-4=5

n(A n B)=4

n(A U B)=11+5+4=20

5 0

3 years ago

Please answer thoroughly

aleksklad [387]

Answer:

Part A: 2k(2c2+5(2)-8c-20)

Part B: sorry i don't know how to do this part

Step-by-step explanation:

Part A, you divide each number by 2 first so you get a simplified version of each number. Then, you will quickly realize that the varible k is similar in all of the numbers then you remove that and put it with the 2 outside the (). Hope you understood my explination.

7 0

3 years ago